Wallboard saw



FIG. 1 is a perspective view of a wallboard saw showing my design, looking downwardly at a front and left side thereof;

FIG. 2 is a left side elevational view of the wallboard saw;

FIG. 3 is a right side elevational view of the wallboard saw;

FIG. 4 a top plan view of the wallboard saw;

FIG. 5 is a bottom plan view of the wallboard saw;

FIG. 6 is a front elevational view of the wallboard saw; and,

FIG. 7 is a rear elevational view of the wallboard saw. 

The ornamental design for a wallboard saw, as shown and described. 